CN218547195U

CN218547195U - Collimated light illumination system

Info

Publication number: CN218547195U
Application number: CN202221545559.9U
Authority: CN
Inventors: 贾睿; 郉志广; 武飞; 冷振; 周钟海; 姚毅
Original assignee: Shenzhen Lingyun Shixun Technology Co ltd; Suzhou Luster Vision Intelligent Device Co Ltd; Suzhou Lingyunguang Industrial Intelligent Technology Co Ltd
Current assignee: Shenzhen Lingyun Shixun Technology Co ltd; Suzhou Luster Vision Intelligent Device Co Ltd; Suzhou Lingyunguang Industrial Intelligent Technology Co Ltd
Priority date: 2022-06-20
Filing date: 2022-06-20
Publication date: 2023-02-28
Anticipated expiration: 2032-06-20

Abstract

The utility model discloses a collimated light lighting system. The system comprises an LED light source, a first lens, a second lens, a third lens and a half-transmitting and half-reflecting mirror; the light-emitting diode light source, the first lens, the second lens, the third lens and the half-transmitting and half-reflecting mirror are arranged in sequence from an object space to an image space; the first lens is of a biconvex structure, and the focal power is positive; the second lens is of a double-convex structure, and the focal power is positive; the third lens is of a meniscus structure, and the focal power is negative. Use the technical scheme of the utility model, can realize improving illuminating light's parallelism, illuminance and illumination zone to can effectively detect the defect of the weak unsmooth class in surface among the product appearance detects.

Description

Collimated light illumination system

Technical Field

The utility model relates to an outward appearance detects and the lighting technology field especially relates to a collimated light lighting system.

Background

In the production process of products, any product can generate some bad appearances, and electronic products are no exception. Appearance detection of electronic products puts higher requirements on detection efficiency and detection range.

In the conventional electronic product appearance detection application, the appearance detection is usually performed in a manner that a high-speed camera is matched with a telecentric light source or a high-speed camera is matched with coaxial light and multi-angle line side light. However, in the prior art, the lighting systems for appearance inspection are all unidirectional focusing light sources, and cannot fully present the appearance defects of electronic products, thereby affecting the accuracy of appearance inspection.

Disclosure of Invention

The utility model provides a collimated light lighting system to realize improving illuminating light's parallelism, illuminance and illumination zone.

The embodiment of the utility model provides a collimated light lighting system, this system includes emitting diode light source, first lens, second lens, third lens and half-transmitting and half-reflecting mirror;

the light-emitting diode light source, the first lens, the second lens, the third lens and the half-transmitting and half-reflecting mirror are sequentially arranged in a direction perpendicular to a central axis where the lens and a product to be detected are located, and the distance between the light-emitting diode light source and the lens and the product to be detected is the largest;

the first lens is of a biconvex structure, and the focal power is positive; the second lens is of a double-convex structure, and the focal power is positive; the third lens is of a meniscus structure, and the focal power is negative.

Optionally, a surface of the first lens close to the second lens is an even-order aspheric surface.

Optionally, the second lens is connected to the third lens.

Optionally, the refractive index of the first lens is greater than or equal to 1.461 and less than or equal to 1.650;

the first lens has an Abbe number of 40 or more and 70 or less.

Optionally, the refractive index of the second lens is greater than or equal to 1.461 and less than or equal to 1.650;

the second lens has an Abbe number of 40 or more and 70 or less.

Optionally, the refractive index of the third lens is greater than or equal to 1.653 and less than or equal to 1.850;

the third lens has an abbe number of 25 or more and 50 or less.

Optionally, the light emitting diode light source is a light emitting diode lamp bead array or a light emitting diode optical fiber coupling light source.

Optionally, the diameter of the light source of the light emitting diode is less than or equal to 8mm, and the object-side numerical aperture is less than or equal to 0.574.

Optionally, the transmittance of the half mirror is 5:5.

the utility model discloses technical scheme has solved the lighting system among the prior art and can't demonstrate the appearance defect of electronic product comprehensively through optical element's such as different lenses and semi-transparent half-reflection mirror combination and range to can influence the problem of the accuracy that the outward appearance detected, the embodiment of the utility model provides an in collimated light lighting system, simple structure, the parallelism of light is good, illuminance is high, illumination zone is wide, can effectively detect the defect of the weak unsmooth class in surface among the product appearance detects.

It should be understood that the statements herein are not intended to identify key or critical features of any embodiment of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a collimated light illumination system provided by the present invention;

fig. 2 is an energy distribution diagram of an illumination surface of a collimated light illumination system provided by the present invention;

fig. 3 is a schematic structural diagram of an appearance inspection system provided by the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is the utility model provides a pair of collimated light lighting system's schematic structure diagram, the collimated light lighting system of this embodiment is applicable to the condition that carries out product appearance detection to with shoot devices such as high-speed camera and be used by the product cooperation.

As shown in fig. 1, the system includes an led light source 0, a first lens G1, a second lens G2, a third lens G3, and a half mirror G4.

The light-emitting diode light source 0, the first lens G1, the second lens G2, the third lens G3 and the half-transmitting and half-reflecting mirror G4 are sequentially arranged along a direction vertical to a central axis where the lens and a product to be detected are located, and the distance between the light-emitting diode light source and the lens and the product to be detected is the largest;

the first lens G1 is a biconvex structure, and the focal power is positive; the second lens G2 is of a biconvex structure, and the focal power is positive; the third lens G3 is of a meniscus structure, and the focal power is negative.

The Light Emitting Diode Light source is also referred to as an LED (Light Emitting Diode) Light source, and optionally, the Light Emitting Diode Light source may be an LED bead array or an LED fiber-coupled Light source.

Further, the diameter of the light source of the light emitting diode is smaller than or equal to 8mm, and the object-side numerical aperture is smaller than or equal to 0.574. The object-side Numerical Aperture, i.e. the object-side NA (Numerical Aperture), is used to measure the angular range of light that can be collected by the illumination system. The half divergence angle of the light emitting diode light source is less than or equal to 35 °.

The first lens G1 is a biconvex lens, and optionally, a surface of the first lens G1 close to the second lens G2 is an even aspheric surface.

The second lens G2 is a biconvex lens, the third lens G3 is a meniscus structure, and optionally, the second lens G2 is connected to the third lens G3. For example, the second lens G2 and the third lens G3 may be glued together, but the embodiment does not limit the connection manner of the second lens G2 and the third lens G3.

Optionally, the refractive index of the first lens G1 is greater than or equal to 1.461 and less than or equal to 1.650; the first lens G1 has an Abbe number of 40 or more and 70 or less.

Optionally, the refractive index of the second lens G2 is greater than or equal to 1.461 and less than or equal to 1.650; the abbe number of the second lens G2 is greater than or equal to 40 and less than or equal to 70.

Optionally, the refractive index of the third lens G3 is greater than or equal to 1.653 and less than or equal to 1.850; an abbe number G3 of the third lens is greater than or equal to 25 and less than or equal to 50.

Optionally, the transmittance of the half mirror G4 is 5:5.

the light from the led light source 0 passes through the first lens G1, the second lens G2, the third lens G3 and the half mirror G4, and becomes collimated light which is relatively parallel.

Fig. 2 provides an illumination surface energy distribution diagram of a collimated light illumination system, as shown in fig. 2, the illumination surface energy distribution formed by the collimated light illumination system of the embodiment is relatively uniform, and after light of an LED light source passes through the collimated light illumination system, uniform light spots can be formed on the surface of a measured product.

Fig. 3 provides a schematic structural diagram of an appearance inspection system, as shown in fig. 3, the appearance inspection system includes a collimated light illumination system, a photosensitive chip 10, a lens 20, and a product under inspection 30. The photosensitive chip 10, the lens 20, the product 30 to be tested and the half-mirror G4 in the collimated light illumination system are on the same axis.

According to the technical scheme, the illuminating surface with the diameter of 60mm can be achieved through the combination of the optical elements, the working distance can reach 300mm, the uniformity of the illuminating surface is larger than or equal to 95%, the energy efficiency utilization rate of the LED light source is larger than or equal to 98%, and the detecting visual field with the diameter of 55mm can be completely and uniformly covered. Adopt the utility model discloses collimated light lighting system can effectively detect the defect of the weak unsmooth class in surface among the product appearance detects.

The utility model discloses technical scheme through the combination and the range of optical element such as different lens and semi-transparent semi-reflective mirror, has solved the lighting system among the prior art and can't demonstrate the appearance defect of electronic product comprehensively to can influence the problem of the accuracy that the outward appearance detected, the embodiment of the utility model provides an in collimated light lighting system, simple structure, the parallelism of light is good, illuminance is high, illumination zone is wide, can effectively detect the weak unsmooth defect of type in surface among the product appearance detection.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A collimated light illumination system is characterized by comprising an LED light source, a first lens, a second lens, a third lens and a half-transmitting and half-reflecting mirror;

the light-emitting diode light source, the first lens, the second lens, the third lens and the half-transmitting and half-reflecting mirror are sequentially arranged along a direction vertical to a central axis where the lens and a product to be detected are located, and the distance between the light-emitting diode light source and the lens and the product to be detected is the largest;

2. The system of claim 1, wherein a surface of the first lens proximate to the second lens is an even aspheric surface.

3. The system of claim 1, wherein the second lens is coupled to the third lens.

4. The system of claim 1, wherein the first lens has a refractive index greater than or equal to 1.461 and less than or equal to 1.650;

the first lens has an Abbe number of 40 or more and 70 or less.

5. The system of claim 4, wherein the second lens has a refractive index greater than or equal to 1.461 and less than or equal to 1.650;

the second lens has an Abbe number of 40 or more and 70 or less.

6. The system of claim 5, wherein the third lens has a refractive index greater than or equal to 1.653 and less than or equal to 1.850;

the third lens has an abbe number of 25 or more and 50 or less.

7. The system of claim 1, wherein the led light source is an led light bead array or an led fiber coupled light source.

8. The system of claim 7, wherein the led light source has a diameter of less than or equal to 8mm and an object-side numerical aperture of less than or equal to 0.574.

9. The system of claim 1, wherein the half mirror has a transmittance of 5:5.